Acute and chronic effects of flosequinan on resting and exercise haemodynamics in congestive heart failure.

Abstract

1 The acute and chronic (8 weeks) haemodynamic responses to oral flosequinan have been investigated in 12 male patients of mean age 58.9 years with congestive heart failure of N.Y.H.A. classes II and III. 2 Flosequinan 125 mg orally significantly reduced right atrial pressure, pulmonary artery pressure and pulmonary wedge pressure prior to and following 8 weeks chronic treatment (125 mg daily). A significant decrease in systemic pressure and an increase in heart rate were also observed with acute flosequinan prior to chronic treatment. A reduction in systemic vascular resistance and an increase in cardiac index reached significance in response to flosequinan 125 mg orally following 8 weeks of therapy. 3 In the erect position, flosequinan reduced pulmonary wedge pressure and tended to reduce systemic vascular resistance, without decreasing mean arterial pressure. 4 Following chronic treatment, there was a trend towards a reduction in pulmonary wedge pressure and an increase in cardiac index, otherwise resting and exercise haemodynamics were unchanged. 5 The response to flosequinan was similar at week 1 and after 8 weeks of treatment for all of the haemodynamic parameters. 6 Flosequinan increased bicycle exercise times and attenuated exercise-induced increases in pulmonary arterial and systemic pressures. There was a trend towards an increase in treadmill exercise time. 7 Sublingual glyceryl trinitrate (0.5 mg) and oral flosequinan (125 mg) had similar effects on right atrial pressure, pulmonary arterial and pulmonary wedge pressures at 5 min and 2 h respectively post-dosing. A small additive effect on pulmonary arterial and wedge pressures was observed.